Combined lock and switch



Oct. 13, 1936. B KW ET AL 2,057,301

COMBINED LOCK AND SWITCH Filed April 8, 1935 INVENTORS Boris Golokow and Samuel G. Chiriin Patented Oct. 13, 1936 2 UNITED STATES PATENT OFFICE COLIBINED LOCK AND SWITCH Boris Golokow and Samuel G. Chirlin, Buffalo, N. Y., assignors of one-third to J. W. Lansing, Buffalo, N. Y.

Application April 8, 1933, Serial No. 665,174 6 Claims. (Cl. 200-42) This invention relates to improvements in I I! which is adapted to operate the door bolt locks for use in connection with burglar alarm when the proper key is inserted in the lock and circuits and more particularly the invention is turned. The body I and key holder II are each concerned with a combined lock and switch, the formed with a series of bores 13 and 1 respec- 5 switch being associated with the lock in such a tively, the bores of one series registering with 5 manner that an alarm is sounded if an unauthose of the companion series when the key thorized attempt is made to operate the lock holder is in the position in which the proper key either by picking or by a key other than the may be inserted. Tumblers l5 and I6 are ar- D DBI key. ranged in the bores I3 and II respectively. The

One object of the invention is to provide a tumblers I 8 project into the key passageway and, 10

construction of the kind generally described in under the influence of springs I! which are arwhich the switch is incorporated in a lock of ranged behind the tumblers I5, assume a posistandard design. tion in which the key holder II, and hence the A still further object is to provide a construcdoor bolt, is held against movement. Upon intion in which the circuit closing element of the sertion of the proper key, which is indicated at 15 switch is associated with the lock in such a manl8 (Figure 1), the adjacent ends of the comner that as it is moved to close an alarm cirpanion pairs of the tumblers are aligned with cuit it assumes a position which will prevent respect to the zone of division between the body operation of the lock. l and the key holder H as is conventional in a A still further object is to provide a conlock of this type, whereby to permit turning of struction which will enable the use of a key of the key holder to operate the door bolt. standard design. In accordance with the invention means is A still further object is to provide a lock havprovided whereby upon the insertion in the ing a switch associated therewith in such a lock of a picking instrument or any key other manner that the alarm circuit is not closed than the proper-key an alarm or warning sigwhen the proper key is employed." rial is given. To this end the key holder H is The invention is illustrated in the accompanyformed with a recess IS, the latter being in ing drawing, in which: alignment with the series of bores M in which Figure 1 is a sectional view of a lock in the tumblers l6 are located. An element 20 is 0 which features of the invention are incorporated, slidably mounted in the recess 19. Normally the the circuit for the alarm being shown 'diagramelement is retracted and lies wholly within the matically. said recess, whereby to permit turning of the Figure 2 is an enlarged fragmentary section key holder in the conventional manner when the taken along line 22 of Figure 1. proper key is inserted. When in this position Figure 3 is a view similar to Figure 1 showing the inner end of the element extends into the a modified form of circuit closing element, the key passageway. The key It! (Figure 1) which said element being illustrated in the circuit 0105- is employed in connection with the lock is prefing position to which it is moved upon the insererablylof a standard design exceptthat it is cut tion of an' improper key in the lock. awayat its forward end as at l8a so that the Figure 4 is an enlarged perspective view of the said end-will pass beneath the end of the ele- 40 circuit closing element shown in Figures 1 and 2. ment, when the key is inserted, without moving Figure 5 is a view similar to Figure 2 of another the element. In the embodiment shown in' Figembodiment of the invention. ures 1 and 2 the element 20 is held in its re- Figure 6 is an enlarged fragmentary section tracted position by springs 23, the said springs 5 taken along line of Figure being located in recesses 24 which are formed in The alarm is illustrated, by way of example, the key holder II at opposite sides of the elein connection with a lock of the so-called Yale ment. The springs 23 engage the projections type. The lock, therefore, includes a barrel- ,25 which are formed or provided upon the elelike body I which is suitably secured in a door, ment 20 and resiliently hold the element in its the latter being suificiently indicated at 8. The retracted position. 5

body I is formed with a flange 9 which fits The element 20 is adapted when engaged against the outer face of the door and with a either by a picking instrument or a key other longitudinal cylindrical chamber l0. Akey holdthan the proper key, although the latter may er H is rotatably mounted in the chamber Ill, be of a standard design with reference to the the said holdercarrying a suitable cam or lever particular type of lock, to be moved axially out 55 of the recess |9 against the action of the springs 23. This movement of the element 2|] is availed of to close an alarm circuit. To this end the body is provided with a recess 26 which, when the key holder I! is adjusted to permit operation of the tumblers, is aligned with the recess I9 in which the element 20 is located. Hence, as the element 20 is moved axially out of the recess |9 the head 20a thereof enters the recess 26. A conductor 21 is arranged axially of the recess 26, the said conductor terminating in a contact 29 and being insulated from the body 1 by an insulating sleeve 21a. The latter is adapted to support the contact 28 at a short distance from the entrance to the recess 26, whereby as the head 20a of the element enters the recess it engages the contact 28.

The conductor 21 is connected by a wire 29 to one side of a coil 3| of the electric magnet, the other side of the coil being connected by a wire 32 to one side of a battery 33. The other side of the battery is grounded by a wire 34 to the body I. An alarm or other suitable signalling device 35 is connected by a wire 36 to the wire 34 and by a wire 31 to a terminal 38. The said terminal is connected by a wire 39 to the stem 40 of a bridge-piece 4|. The latter is located in spaced relation with respect to the poles of a permanent magnet 42 of the horseshoe type, the spacing between the poles of the permanent magnet and the bridge-piece being such that the magnet of itself is not capable of pulling the bridge-piece against the said poles. A bar 43 which is arranged in the coil 3| is located in close proximity to the bridge-piece whereby upon energization of the coil the bar is magnetized andthe bridge-piece is pulled upwardly against the poles of the permanent magnet, the latter being capable of holding the bridge-piece when it is moved to this position. The permanent magnet 42 is connected by a wire 44 to the wire 32. Hence, upon movement of the bridgepiece against the poles of the permanent magnet the bridge-piece is electrically connected to the wire 32.

From the foregoing it will be apparent that when the element 20 is moved against the contact 28 a circuit is completed through the coil 3|, the said circuit including conductor 21a, Wire 29 to one side of the coil, wire 32 which is connected to the opposite side of the coil to battery and battery to ground. Upon energization of the coil 3| the bridge-piece 4| is pulled against the poles of the permanent magnet 42 and a circuit is established through the alarm 35, the said circuit including one side of the battery 33, wire 32, wire 44, bridge-piece 4|, stem 40 thereof, wire 39, terminal 39, wire 31 to one side of the alarm 35 and wire 36 from the other side of the alarm to the other side of the battery. It will be apparent, therefore, that when the bridge-piece 4| is moved against the poles of the permanent magnet 42 it will be held in this position even though the element l9 may be moved to break the circuit through the coil 3|. The circuit, therefore, which is established through the alarm 35 will be maintained until the bridge-piece 4| is moved out of contact with the poles of the permanent magnet 42. The bridge-piece may be moved to break the circuit through the alarm by a control element 45, the said element being mounted upon a pin 46. The element is normally held at one end of the pin by a spring 41. At its upper and lower ends the element is formed with oppositely extending fingers 49 and 49. The former is adapted to be grasped to move the element downwardly against the action of the spring 41 while the latter extends into the path of a projection 50, which is formed on the stem 40 of the bridgepiece 4|, whereby as the element 45 is moved downwardly the finger 49 engages the projection 50 to pull the bridge-piece away from the poles of the magnet 42. It is understood, of course, that the warning device 35, control element 45 and associated mechanisms may be located upon the back of the door with which the alarm is associated or at any convenient point within the house and that, if desired, the alarm may be incorporated in any conventional type of burglar alarm system.

In the embodiment shown in Figure 5 the circuit closing element 5| is of a cross-section similar to that of the tumblers. It is normally located wholly within a passage 52 which is formed in the key holder and the lower end thereof terminates in the key passageway at such a point that when the, proper key is inserted the forward end of the key passes beneath the element, without moving it, as described in connection with the embodiment shown in Figure 1. In this embodiment the use of the springs, such as the springs 23 (Figure 2), for holding the circuit closing element in its retracted position is dispensed with, the said element normally assuming and maintaining, by gravity, its fully retracted position. Upon the insertion of an improper key (indicated at |9a) or in the event that an attempt is made to pick the lock it is moved axially to close the circuit through the alarm device in the manner described. It will be apparent that in the two embodiments described the circuit closing element is normally located wholly within the key holder and that its position is not disturbed when the proper key is inserted in the lock. The said element is only moved from its retracted position when a picking instrument or an improper key is inserted in the look. In such a case as the element moves to its circuit closing position it locks the key holder, and hence the bolt operating mechanism, against movement.

In the embodiment illustrated in Figures 3 andfi, the circuit closing means consists of cooperating elements 53 and 54 which are similar to the tumblers |5 and I6. The said elements are located in recesses 53a and 54a which are formed in the body and key holder respectively of the lock. Normally the elements 54 are seated in the bottom of the recess 54a and the element 53 is located partially within the recess 53a and partially within the recess 54a as indicated in dotted lines in Figure 6. The elements, therefore, while in this position prevent rotation of the key holder and hence operation of the lock. Upon the insertion of the proper key in the lock the elements are moved to the full-line position shown in. Figure 6, that is to say to a position in which the elements are located wholly within their respective recesses. When so located the key holder may be turned to operate the look. In the event that an improper key 55 (Figure 3) is inserted in the lock the element 54 enters the recess 53a and causes the element 53 to engage the contact 28 thereby connecting the contact 28 to ground and completing the circuit which includes the alarm device 35. It will be apparent. therefore. that the circuit closing elements are similar to and function in substantially the same manner as the pairs of tumblers l5 and IS. The elements 53 and 54 may, therefore, be utilized, in addition to their primary function, as one of the sets of the tumblers. Hence the lock and the key therefor may be of standard construction. A further advantage obtained is that in the event that an attempt is made to remove the entire look from the door, the element 53 will move by gravity to close the alarm circuit as soon as the body of the lock is turned over.

From the foregoing it will be apparent that the circuit closing elements are so located that in the event that the proper key is inserted in the lock the latter is permitted to operate in the conventional manner. If, however, an unauthorized attempt is made to operate the lock an alarm is given and the circuit closing element in its movement to close the alarm circuit assumes such a position that the lock cannot be operated.

We claim as our invention:

1. A look for controlling a burglar alarm circuit, said lock including a body to which one side of said circuit is adapted to be grounded, a key holder havin: a key passageway formed therein, said body and key holder being formed with cooperating recesses in which tumblers are arranged and which are aligned to permit a key to be inserted in said key passageway, a contact terminal which is adapted to be connected to the other side of said circuit and which is insulated from said body and an electrically conductive element which is grounded to said body and which extends into said passageway, said element being movable to engage said contact terminal and connect it to ground, thereby to close said alarm circuit, said element being normally spaced from said contact and being so formed-that the proper key to said lock may be inserted in said passageway without moving it to such an extent as to engage said contact terminal, whereby to prevent closing said alarm circuit when the proper key is 2. A look for controlling a burglar alarm circuit, said lock including a body towhich one side of said circuit is adapted tov be grounded, a key holder having a key passageway formed therein, said body and key holder being formed with cooperating recesses in which tumblers are arranged and which are aligned to permit a key to be inserted in said key passageway, a contact terminal which is adapted to be connected to the other side of saidcircuit and which isinsulated from said body and an electrically conductive element which is grounded to said body and which extends into said passageway, said element being movable to engage said contact terminal to connect it to ground and thereby to close said alarm circuit and being operative when so moved to lock said body and key holder against relative movement, said element being normally spaced from said contact and being so formed that the proper key .to said lock maybe inserted in said passageway without moving it to such an extent as to engage said contact terminal or to lock said body and key holder against relative movement.

3. A look for controlling a burglar alarm circuit, said lock including a body to which one side of said circuitis adapted to be grounded, a key holder having a key passageway formed therein, said body and key holder being formed with cooperating recesses in which tumblers are arranged and which are aligned to permit a key to be inserted in said passageway, a contact terminalwhich is adapted to be connected to the other side of said circuit and which is insulated from said body and an electrically conductive element which is grounded to said body and which is located wholly in one of said recesses, said element being normally spaced from said contact terminal and being movable to engage it and connect it to ground thereby to close said circuit, said element being so formed that the proper key may be inserted in said passageway without moving it to such an extent as to engage said contact terminal, whereby to prevent closing of said alarm circuit when the proper key is used.

4. A look for controlling a burglar alarm circuit, said lock including a body to which one side of said circuit is adapted to be grounded, a rotatable key holder having a key passageway formed therein, said body and key holder being formed with companion series of recesses which are aligned to permit insertion of a key, tumblers in said recesses and a contact terminal which is carried by, but insulated from, said body and to which the other side of said circuit is adapted to be connected, one of said tumblers'being normally spaced from said contact terminal and extending into said passageway, said tumbler occupying such position when the proper key is inserted in the lock, whereby to keep said circuit open and being movable, as upon the insertion of an improper key, to connect said contact terminal to ground and thereby close said alarm circuit.

5. A lock for controlling a burglar alarm circuit, said lock including a body to which one side of said circuit is adapted to be grounded, a rotatable key holder, said body and key holder being formed with companion series of recesses which are aligned to permit insertion of a key, pairs of tumblers in said recesses and a contact terminal which is carried by, but insulated from, said body and to which the other side of said circuit is adapted to be connected, one of said pairs of tumblers having electrical contact with said body, said tumblers being normally spaced from said contact terminal to lock said body and key holder against relative movement and being so formed that upon insertion of the proper key they' are moved, without engaging said contact terminal, to a position in which they enable relative movement between said body and said key holder to permit operation of said look without closing said circuit, said tumblers being adapted upon movement beyond said position, as upon the insertion of an improper key, to engage said contact terminal and connect it to ground and thereby to close said alarm circuit.

6. A look for controlling a burglar alarm circuit, said lock including a body to which one side of saidcircuit is adapted to be grounded, a rotatable key holder, said body and key holder being formed with companion series of recesses which are aligned to permit insertion of a key, pairs of tumblers in said recesses and a contact terminal which is carried by, but insulated from, said body and to which the other side of said circuit is adapted to be connected, one of said pairs of tumblers having electrical contact with said body, said tumblers being normally spaced from said contact terminal to lock said body and key holder a ainst relative movement and being so formed that upon insertion oi the position, as upon the insertion of an improper P pe y ey a e oved. without engaging key,- to engage said contact terminal to close said con a t t mina to a p s t n in wh ch said circuit and at the same time lock said body t y e b relative movement betweensa-ld and key holder against relative movement. body and said key holder to permit; operation 01.

said iockwithout closing said circuit, said tum- BORIS GOLOKOW, blers being adapted upon movement beyond said SAMUEL G. CHIRLIN. 

